diff --git a/tuxbot/core/checks.py b/tuxbot/core/checks.py
index 8838d10..865f15f 100644
--- a/tuxbot/core/checks.py
+++ b/tuxbot/core/checks.py
@@ -22,6 +22,9 @@ __all__ = [
 
 
 def is_mod():
+    """Is the user a moderator ?
+
+    """
     async def pred(ctx):
         if await ctx.bot.is_owner(ctx.author):
             return True
@@ -32,6 +35,9 @@ def is_mod():
 
 
 def is_admin():
+    """Is the user admin ?
+
+    """
     async def pred(ctx):
         if await ctx.bot.is_owner(ctx.author):
             return True
@@ -42,6 +48,15 @@ def is_admin():
 
 
 async def check_permissions(ctx: "ContextPlus", **perms: Dict[str, bool]):
+    """Does a user have any perms ?
+
+    Parameters
+    ----------
+    ctx:ContextPlus
+        Command context.
+    **perms:dict
+        Perms to verify.
+    """
     if await ctx.bot.is_owner(ctx.author):
         return True
 
@@ -55,6 +70,13 @@ async def check_permissions(ctx: "ContextPlus", **perms: Dict[str, bool]):
 
 
 def guild_owner_or_permissions(**perms: Dict[str, bool]):
+    """Is a user the guild's owner or does this user have any perms ?
+
+    Parameters
+    ----------
+    **perms:dict
+        Perms to verify.
+    """
     async def pred(ctx):
         if ctx.author is ctx.guild.owner:
             return True
diff --git a/tuxbot/core/config.py b/tuxbot/core/config.py
index 8d9a621..b9ec0ed 100644
--- a/tuxbot/core/config.py
+++ b/tuxbot/core/config.py
@@ -1,15 +1,14 @@
 import json
 import logging
-
-__all__ = ["Config"]
-
-from typing import List, Dict, Union
+from typing import List, Dict, Union, Any
 
 import discord
 
 from tuxbot.core.data_manager import data_path
 
-log = logging.getLogger("tuxbot.config")
+__all__ = ["Config"]
+
+log = logging.getLogger("tuxbot.core.config")
 
 
 class Config:
@@ -40,14 +39,40 @@ class Config:
         return self.__getitem__(item)
 
     def owners_id(self) -> List[int]:
+        """Simply return the owners id saved in config file.
+
+        Returns
+        -------
+        str
+            Owners id.
+        """
         return self.__getitem__('core').get('owners_id')
 
     def token(self) -> str:
+        """Simply return the bot token saved in config file.
+
+        Returns
+        -------
+        str
+            Bot token.
+        """
         return self.__getitem__('core').get('token')
 
     def get_prefixes(self, guild: discord.Guild) -> List[str]:
+        """Get custom  prefixes for one guild.
+
+        Parameters
+        ----------
+        guild:discord.Guild
+            The required guild prefixes.
+
+        Returns
+        -------
+        List[str]
+            List of all prefixes.
+        """
         core = self.__getitem__('core')
-        prefixes = core\
+        prefixes = core \
             .get('guild', {}) \
             .get(guild.id, {}) \
             .get('prefixes', [])
@@ -55,6 +80,18 @@ class Config:
         return prefixes
 
     def get_blacklist(self, key: str) -> List[Union[str, int]]:
+        """Return list off all blacklisted values
+
+        Parameters
+        ----------
+        key:str
+            Which type of blacklist to choice (guilds ? channels ?,...).
+
+        Returns
+        -------
+        List[Union[str, int]]
+            List containing blacklisted values.
+        """
         core = self.__getitem__('core')
         blacklist = core \
             .get('blacklist', {}) \
@@ -62,7 +99,24 @@ class Config:
 
         return blacklist
 
-    def update(self, cog_name, item, value) -> dict:
+    def update(self, cog_name: str, item: str, value: Any) -> dict:
+        """Update values in config file.
+
+        Parameters
+        ----------
+        cog_name:str
+            Name of cog who's corresponding to the config file.
+        item:str
+            Key to update.
+        value:Any
+            New values to apply.
+
+        Returns
+        -------
+        dict:
+            Updated values.
+
+        """
         datas = self.__getitem__(cog_name)
         path = data_path(self._cog_instance)
 
diff --git a/tuxbot/core/data_manager.py b/tuxbot/core/data_manager.py
index 1bd4d9a..789641c 100644
--- a/tuxbot/core/data_manager.py
+++ b/tuxbot/core/data_manager.py
@@ -3,7 +3,7 @@ from pathlib import Path
 
 import appdirs
 
-log = logging.getLogger("tuxbot.data_manager")
+log = logging.getLogger("tuxbot.core.data_manager")
 
 app_dir = appdirs.AppDirs("Tuxbot-bot")
 config_dir = Path(app_dir.user_config_dir)
diff --git a/tuxbot/core/i18n.py b/tuxbot/core/i18n.py
index 09f3977..00b579e 100644
--- a/tuxbot/core/i18n.py
+++ b/tuxbot/core/i18n.py
@@ -1,3 +1,4 @@
+import logging
 import os
 from pathlib import Path
 from typing import Callable, Union, Dict
@@ -9,6 +10,8 @@ __all__ = [
     "Translator",
 ]
 
+log = logging.getLogger("tuxbot.core.i18n")
+
 _translators = []
 _current_locale = "en-US"